Instead of being a true rival to FIAT, it became a thing with a toxic-as-hell commumity, fraud, and basically its nothing more than a high risk stock. The risk is NOT only "will this go up or down" but you have a high risk of being robbed, as have happened to millions of people.
Maybe there will be a better alternative in the future, but right now bitcoin is not it.
Using a cryptocurrency (originally) meant basically opting out of the governmental violence-as-a-service for cryptocurrency/-token purposes and taking care of this aspect by yourself.
Depending on your resourcefulness and lifestyle, this may mean
- hiring personal security
- being very careful about privacy aspects, e.g. making it very hard to link your personal identity to your cryptographic keys; distribute your crypto-tokens among many keys so that if one key gets "linked", the attacker will find only few tokens there; use anonymization services; ...
- think about what mitigations you have in place against "rubber hose attacks"
- live a modest life so that people (and also taxation authorities?) don't get suspicious that you are secretly rich, i.e. don't boast about your richness
- ...